2018ApJ...862...63C

Query : 2018ApJ...862...63C

2018ApJ...862...63C - Astrophys. J., 862, 63-63 (2018/July-3)

Searching for inflow toward massive starless clump candidates identified in the Bolocam Galactic Plane Survey.

CALAHAN J.K., SHIRLEY Y.L., SVOBODA B.E., IVANOV E.A., SCHMID J.R., PULLEY A., LAUTENBACH J., ZAWADZKI N., BULLIVANT C., COOK C.W., GRAY L., HENRICI A., PASCALE M., BOSSE C., CHANCE Q., CHOI S., DUNN M., JAIME-FRIAS R., KEARSLEY I., KELLEDY J., LEWIN C., MAHMOOD Q., McKINLEY S., MITCHELL A.M. and ROBINSON D.R.

Abstract (from CDS):

Recent Galactic plane surveys of dust continuum emission at long wavelengths have identified a population of dense, massive clumps with no evidence for ongoing star formation. These massive starless clump candidates are excellent sites to search for the initial phases of massive star formation before the feedback from massive star formation affects the clump. In this study, we search for the spectroscopic signature of inflowing gas toward starless clumps, some of which are massive enough to form a massive star. We observed 101 starless clump candidates identified in the Bolocam Galactic Plane Survey (BGPS) in HCO⁺J = 1-0 using the 12 m Arizona Radio Observatory telescope. We find a small blue excess of E=(N_blue-N_red)/N_total=0.03 for the complete survey. We identified six clumps that are good candidates for inflow motion and used a radiative transfer model to calculate mass inflow rates that range from 500 to 2000 M_☉ Myr^–1. If the observed line profiles are indeed due to large-scale inflow motions, then these clumps will typically double their mass on a freefall time. Our survey finds that massive BGPS starless clump candidates with inflow signatures in HCO⁺J = 1-0 are rare throughout our Galaxy.

Journal keyword(s): ISM: clouds - ISM: molecules - ISM: structure - stars: formation

VizieR on-line data: <Available at CDS (J/ApJ/862/63): table1.dat>

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 1

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Number of rows : 1

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2026	#notes
1	NAME Serpens Cloud	SFR	18 29 49	+01 14.8						~	1195	1

Query : 2018ApJ...862...63C

Basic data :

NAME Serpens Cloud -- Star Forming Region
Other object types:	`Cld ()`, `SFR (2014AJ)`
ICRS coord. (ep=J2000) :	`18 29 49.0 +01 14 48 [ ] E ~`
FK4 coord. (ep=B1950 eq=1950) :	`18 27 16.6 +01 12 43 [ ]`
Gal coord. (ep=J2000) :	`031.5748 +05.3787 [ ]`

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`NAME SER MCLD`	`NAME Ser Dark Cloud`	`NAME Serpens Cloud`
`NAME Ser Cloud`	`NAME Ser MC-1`	`NAME Serpens Dark Cloud`

References (1195 between 1850 and 2026) (Total 1195)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).

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